Fluid-pressure brake



Sept. 20, 1927. .64

R. S. M INTOSH FLUID PRESSURE BRAKE Filed Sept. 22. 1926 Patented Sept. 29, 1 927.

PATENT I OFFICE.

RoennsHEnMA McII-IIOSI-I, or 'I-IAZARID, KENTUCKY.

r UIn-rnEss n-n BRAKE.

Application fled September This invention relates to improvements in fluid pressure brakes, and more particularly to improvements in the E. 'T. I locomotive brake equipment. i

The invention has for one of its objects to providenovel and simple means adapted to prevent the casual application of the brakes on the locomotive as the result of a variation in the pressure due to a leak in the brake pipe or a faulty or dirty feed valve.

The invention is hereinafter fully described and claimed, and illustrated in the accompanying drawing, wherein:

Figure 1 is a view partly in elevation and partly in vertical section illustrating the ap plication of the invention to an E. T. 10-

comotive brake equipment, and

Figure 2 is a sectional view taken on the vertical planes indicated by the line 22 of Figure l.

In the drawing, 1 designates the distributing valve, 2 the independent brake valve which is operated by a handle 3 and 4 the release pipe of the E. T. locomotive-brake equipment. The distributing valve 1 is pro vided' with an application cylinder 5, an

application piston 6, a passage 7 establishing closed by the equalizing piston. This pascommunication between the application cylinder 5 and release pipe 4, and an equalizing slide valve 8. When fluid under pressure is admitted to the application cylinder '5 either by operation of the independent brake valve 2 or by operation of the equaliz' ing slide valve 8, the piston 6 is operated to "7 effect an application of the brakes in a well known manner.

In this'type of brake equipment, a var1ation of pressure, caused for instance by a leak in the brake pipe or a faulty or dirty.

feed valve, would cause the equalizing piston to move in a direction to cut off communication between the release pip 4 and ap plication cylinder 5 by closing the passage 7. With the equalizing pistonin-this position, any leak that would cause air to enter the application cylinder 5 would result in the building up of the pressure in the cylinder and the consequent gradual application of the brakes.

In order to prevent this application or creeping'or leaking on ofthe brakes, there is established communication between the release pipe 4- and application cylinder 5 by way of a passage which is. entirely inclependent of the passage 7 and cannot be 22,1926; Serial nasaoiv.

sage is provided preferably by a pipe 9 which is connected to the distributing valve 1 and release pipe 4 and is in communication with the release pipe and the application cylinder 5 at the left side of the application piston 6. The pipe 9 establishes direct communication between the release pipe 4 and the application cylinder 5, and is provided with a cut out cock 10 for the pupose of. cutting off this direct communication between the release pipe and application cylinder on the second engine in double heading. This direct communication between the release P113641: and application cylinder 5 makes it impossible for the brakes to creep or leak on and cause the tires of the drivers to heat and slip, even though such conditions as dirty feed valves or small leaks in the brake pipe may obtain. It will not, however, prevent-the usual application of the brakes or their application on the opening of the conductors valve at the rear of the train or their application should the train break in two. Should the brakesbe applied as the result of the opening of the conductors valve or as the result of the breaking in two of the train, the engineer will have ample time to lap the brake valve and hold the brakes applied until the train stops. Furthermore, the invention will, after a service application of the brakes and the return of the brake valve to running position, cause the brakes to release quickly.

lVhat is claimed is 1. In a fluid pressure brake, the combination with a distributing valve having an ap- ,plication cylinder and passage communicatmg with said cylinder, and a release pipecommunicating with said passage, and means establishing communication between said pipe and cylinder independently of said passage.

2. In a fluid pressure brake, the combination with a distributingvalve having an application cylinder and passage communicating with the cylinder, and a release pipe communicating with said passage, means establishing communication between said pipe and cylinder independently of said passage, and a cut off valve in the passage established by said means.

3. In a fluid pressure brake, the combination with a distributing valve having an application cylinder and passage communieating with said cylinder, and a release pipe communicating with said passage, of a pipe and establishing direei communication between said pipe and cylinder.

l. In a fluid pressure bra lie, the eo nbination with a tliSl lilll lllljlg' valve having an application cylinder and passage COlIllUllllll eating with said cylinder, and a release pipe communicating With said passage, of a pipe (-StflbllSlllIlg direct eolnnmnicz tion between said pipe and cylinder, and a cut off valve in said pipe.

5. In a fluid pressure brake, a distributing valve having; an application cylinder,

passages eoinnnn licating with the cylinder, and arelease pipe communicating with said lessee (3. 1n :rfl igl pressure brake, a distributing valve having an application cylinder, passages connnunicz'iting with the cylinder, 21 release pipe communicating with said passages, and a cut oil valve in one oi? said 20 passages.

In testimony whereof I ailix my signature.

ROGER SHE MA MQINTOSH 

